Small size high efficiency wideband class-f amplifier based on harmonic stretching
By combining variable cross-section microstrip line structure and PCB routing technology, the problems of second harmonic impedance short circuit and third harmonic impedance open circuit in broadband scenarios of Class F amplifiers are solved, realizing high-efficiency broadband applications and miniaturized design.
Patent Information
- Application Number
- CN202211515933.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-11-29
- Publication Date
- 2026-04-24
- Estimated Expiration
- 2042-11-29
AI Technical Summary
Existing Class F amplifiers are difficult to achieve second harmonic impedance short-circuiting and third harmonic impedance open-circuiting in broadband scenarios, resulting in efficiency of less than 100%. Furthermore, their circuit complexity and large board area limit their miniaturization design in base stations.
A variable cross-section microstrip line structure is adopted. Through parallel or coupled transmission lines of different lengths, and the design of zigzag or oblique microstrip lines, combined with PCB routing technology, multi-layer microstrip superposition is formed to achieve harmonic stretching to expand bandwidth. At node C, the second harmonic impedance is short-circuited and the third harmonic impedance is open-circuited.
It effectively expands the bandwidth of Class F amplifiers, enabling high-efficiency broadband applications, while reducing circuit complexity and board area, which helps in the miniaturization design of base stations, and the process is simple and reliable.